Saint Augustine, Pope Gregory I, Martin Luther, Friedrich Nietzsche, Thomas Paine, Leo Tolstoy, Athanasius of Alexandria, Gregory of Nyssa, John of Damascus, Thomas à Kempis, St. Teresa of Avila, Brother Lawrence, David Hume, Ludwig Feuerbach, Charles Spurgeon, Andrew Murray, G. K. Chesterton, Arthur Pink, Dante Alighieri, John Milton, John Bunyan, Voltaire, Lew Wallace, Henryk Sienkiewicz, Charles M. Sheldon, Henry Van Dyke, Grace Livingston Hill, Fyodor Dostoyevsky, Johann Wolfgang von Goethe, Ralph Waldo Emerson, H. Emilie Cady, James Allen, Prentice Mulford & Florence Scovel Shinn
